body,html
  line-height 1
  font-size 14px
  font-family 'PingFang SC','STHeitiSC-Light','Helvetica-Light',arial,sans-serif

.clearfix
  display: inline-block
  &:after
    display block
    content '.'
    height 0
    line-height 0
    clear both
    visibility hidden

@media(-webkit-min-device-pixel-ratio:1.5),(min-device-pixel-ratio:1.5)
  .border-1px
    &::after
      transform: scaleY(.7)

@media(-webkit-min-device-pixel-ratio:2),(min-device-pixel-ratio:2)
  .border-1px
    &::after
      transform: scaleY(.5)